Camera viewfinder with leveling indicator

Details Camera viewfinder with leveling indicator Camera viewfinder with leveling indicator

1995-01-11

1996-06-18

Hayes, Monroe H.

G03B 1302

Patent

active

055283276

ABSTRACT:
A camera comprises a see-through viewfinder for viewing a subject to be photographed, and a leveling indicator visible in the viewfinder for indicating whether or not the camera is oriented level relative to the subject. The leveling indicator is an optical prism with two similarly-angled front faces which crest at a common boundary to deviate individual light rays reflected from the subject onto the respective front faces towards each other as they emerge at a rear face of the optical prism. Consequently, two images of the subject will be seen through the optical prism which appear to be at the same elevation when the camera is oriented level relative to the subject and appear to be at different elevations when the camera is not oriented level relative to the subject.

REFERENCES:
patent: 525654 (1894-09-01), Hicks
patent: 1167967 (1916-01-01), Anderson
patent: 1964622 (1934-06-01), Draper
patent: 2286810 (1942-06-01), Ingels
patent: 2505140 (1950-04-01), Peltz et al.
patent: 2525558 (1950-10-01), Mihalyi
patent: 3602085 (1971-08-01), Wagner
patent: 4801793 (1989-01-01), Vaynshteyn

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